Malicious PDF — malware analysis report

Static analysis result for SHA-256 36082835ce708e20…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 10:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a967db8ea4ba33a3bc3e459d300eccb4 SHA-1: 13b5107adbab345d00017dee841f6cde89d0f076 SHA-256: 36082835ce708e20063d34be40b7dfb10d0d3597ae4373a8522b142f29333074
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to potentially disposable hosting, suggesting a link farm or redirection mechanism. One URL, http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce573b5018---fomamabusunixev.pdf, is specifically flagged as a link farm. The presence of external URIs and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce573b5018---fomamabusunixev.pdf
    • https://goldmenu.com/userfiles/file/zarevokunodukibixo.pdf
    • https://mahae.hu/files/files/27389722660.pdf
    • https://conviviodihera.it/dati/upload/file/vosogasesuwosomo.pdf
    • https://gulf-rope.com/images/bulk_images/files/kuwedibulopitikol.pdf
    • https://egc.ecrom.work/syo/files/263726304.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/44727116965.pdf
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/gidazobaxikog.pdf
    • https://champion-osk.pl/userfiles/file/21616959925.pdf
    • http://stin-verdon.fr/assets/Image/files/gazagikiwebasalu.pdf
    • https://ontech.vn/images/ckeditor/files/98770430072.pdf
    • http://chatyzvule.cz/uploads/pewilezojafufulute.pdf
    • https://cheesykeju.com/contents/files/94459400334.pdf
    • https://manhalhealing.com/userfiles/file/40782792873.pdf
    • https://drjou-vc.com/upload/files/43797508335.pdf
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/duretan.pdf
    • https://yomadesign.com/userfiles/Proj_Name/files/kisulazuvipupavulo.pdf
    • http://obkladlazby.cz/userfiles/file/felinazi.pdf
    • http://childconnect.com/swi/fckfiles/file/26208179371.pdf
    • https://jurvamartin.com/userfiles/file/rekapugunikusobimu.pdf
    • http://mayingiabao.com/upload/files/wemobavuzaniwonolajote.pdf
    • https://nhaccugiare24h.com/uploads/userfiles/file/tuwukurotederotagax.pdf
    • http://solarissoft.com/img/userfiles/files/76378274760.pdf
    • http://ballmillfactory.com/d/files/vavatexebojugi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=facebook+manager+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FB 16792 bytes
font_01_sfnt_off0000cc12.bin
d0061eb73961a22e5fce25c4d356a87cfeaa64b16486ad793e55b4804a7ce277		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC12 10716 bytes
font_02_sfnt_off0000e466.bin
a5b6572430a9f783f8fa670c3acbad9d6960d037b94f399fc08cd503cddbcbee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 14644 bytes

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